[pre-commit.ci] auto fixes from pre-commit.com hooks

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doc/development/create-a-model.md

@@ -35,6 +35,7 @@ from deepmd.pt.model.descriptor.base_descriptor import (
     BaseDescriptor,
 )
 
+
 @BaseDescriptor.register("some_descrpt")
 class SomeDescript(BaseDescriptor, torch.nn.Module):
     def __init__(self, arg1: bool, arg2: float) -> None:
@@ -72,6 +73,7 @@ from deepmd.dpmodel import (
     fitting_check_output,
 )
 
+
 @GeneralFitting.register("some_fitting")
 @fitting_check_output
 class SomeFittingNet(GeneralFitting):
@@ -111,17 +113,20 @@ from deepmd.pt.model.model.model import (
     BaseModel,
 )
 
+
 class SomeAtomicModel(BaseAtomicModel, torch.nn.Module):
     def __init__(self, arg1: bool, arg2: float) -> None:
         pass
 
     def forward_atomic(self):
         pass
 
+
 @BaseModel.register("some_model")
 class SomeDPModel(make_model(SomeAtomicModel), BaseModel):
     pass
 
+
 class SomeModel(SomeDPModel):
     pass
 ```